What happens in your company on day 91?

Hi Reader, Daria's here.

When I start with a new company — or when I mentor an HR leader — the first number I ask for is attrition in the first 90 days.

Why?

Because when people leave that early, nothing else you build will hold. You can redesign performance management, rewrite the values, run the workshops. None of it lands in a company where people don't want to stay.

That's why I wanted to talk to Nate Hill on this week's Built by People Leaders. Nate spent years building People functions inside fast-scaling companies, and he noticed a pattern that's easy to miss: most companies stop investing in a new hire on day 90, right when probation ends — and that is the exact moment a lot of people decide to leave. He built a whole framework around it and called it The 91st Day.

Most Companies Stop Investing Right When People Decide to Leave

The numbers make it worse. A company spends around $20,000 to find one person, then pulls back all of its cultural attention the moment probation is over. Onboarding that should run a month gets compressed into a single week in a classroom. Managers are told to own onboarding, and no one hands them a plan — so "we're too busy, things move too fast" becomes the reason it never gets built.

The result is predictable. Someone who looked great in week two is updating their résumé by month three.

So the real question isn't how to hire better. It's how to keep the person past the honeymoon.

Three Moves That Keep People Past Day 90

Here’s a simple way to build the 91st day into how your company works. Three moves, in order.

1. Co-build a 30-day onboarding plan with each manager

Sit down with the hiring manager and map the first month for that specific role — the two or three skills that will make or break the job, who to train with, who to talk to. Keep it as a living document the manager can edit.

Why it works: it turns onboarding from a one-week event into a month-long relationship, and it forces the manager to define what “ramped up” means before the new hire is left guessing. That’s what makes the plan worth the hour it takes to build.

2. Run 30, 60, and 90-day self-evaluations

At each checkpoint, ask the new hire to assess themselves — how it’s going, what they want to get better at, how the relationship with their manager feels — and have People review it, not just the manager.

Why it works: a problem shows up as a downward trend on paper before it shows up as a resignation. That gives you weeks to rebuild the plan instead of an exit interview to explain it. Since most resignations land right at 90 days, this is your early-warning system.

3. Translate people problems into cost

Bring the leadership conversation the numbers, not the opinion — turnover, wasted meeting time, disengagement — all of it expressed as money, framed against that $20,000 re-hire.

Why it works: it changes how leadership hears People. A CEO who waves off a retention concern will stop and look when it’s set against a re-hire bill. As Nate put it: “Use HR as your shield, use HR as your partner in crime.” That partnership starts the moment you speak the language leadership already responds to.

What This Looks Like in Practice

The company that does this doesn't find out someone is unhappy in their exit interview. It sees the 60-day self-assessment dip and rebuilds the plan while there's still someone to keep. And leadership funds the fix, because it's been shown the cost of not doing it.

The honeymoon still ends. The attention doesn't.

So here's the question I'd sit with this week: what happens in your company on day 91?

Most places handle day one well. Day 91 is different — the welcome is over, and the attention has moved to the next new hire. If you can't quite answer what happens then, that's usually where the leak is.

Nate put it simply in our conversation: "Always choose the people." The whole 91st day system is a way of meaning it past the point where most companies stop.

The full conversation is out now on Built by People Leaders. If early retention is something you're wrestling with, it's worth the listen — Nate is generous with the specifics.